# "Part of The Whole" (error: 'tuple' object has no attribute 'append')?

#1

Friends, my code is not working for some reason. Can any of you find the problem?

error message says" Oops, try again. get_class_average([alice]) resulted in an error: 'tuple' object has no attribute 'append'"

``````lloyd = {
"name": "Lloyd",
"homework": [90.0, 97.0, 75.0, 92.0],
"quizzes": [88.0, 40.0, 94.0],
"tests": [75.0, 90.0]
}
alice = {
"name": "Alice",
"homework": [100.0, 92.0, 98.0, 100.0],
"quizzes": [82.0, 83.0, 91.0],
"tests": [89.0, 97.0]
}
tyler = {
"name": "Tyler",
"homework": [0.0, 87.0, 75.0, 22.0],
"quizzes": [0.0, 75.0, 78.0],
"tests": [100.0, 100.0]
}

def average(numbers):
total = sum(numbers)
total = float(total)
total = total/len(numbers)
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return (homework * 0.1) + (quizzes * 0.3) + (tests * 0.6)
if score >= 90:
return "A"
elif score >= 80:
return "B"
elif score >= 70:
return "C"
elif score >= 60:
return "D"
else:
return "F"
def get_class_average(students):
results = ()
for student in students:
results.append(get_average(student))
return average(results)``````

#2

You've got the wrong brackets / parentheses.
Not this: `results = ()` but this instead `results = []`

Minor mistake, you'll get used to it

#3

Hi,
@ronybot pretty much told you what's wrong but do you know why it's brackets instead of parentheses?

#4

Are you asking me? I answered it anyways.. Brackets because you're trying to make an empty list, and not a tuple

#5

I was asking him/her to make sure they know why they needed to do that.

#6

yes, I guess its good to know these minor mistakes are normal.

#7

yes, its a list. List's use brackets.

#8

I like how ronybot response was blurred out for me. I'm not sure whether that was purposely done by rony or by code academy but I like that they do that.

#9

and since were in discussion can I ask you what the difference is between a list and a tuple? What are tuple used for? I havent really read or used them just yet, it would be nice to get a heads up.

#10

I did that on my own.. I used the spoiler function, if you wanted to know.

As for your second question, I'll direct you towards this page. I found it useful, you could also learn stuff on your self, because this course doesn't teach you about tuples. Unless they got something coming this update.

#11

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